那个时候你在干什么用英语怎么说

The phrase "What were you doing at that time?" can be translated as "那个时候你在干什么?" in Chinese.

It is a common and informal way of asking someone about their activities or actions during a specific moment in the past. The expression "at that time" refers to a specific point in the past, while "What were you doing" is a way to inquire about someone's behavior during that moment.

Here are a few examples in English with their Chinese translations:

English: "What were you doing at 2 PM yesterday?"
Chinese: "昨天下午2点你在干什么？"

English: "What were you doing when the accident happened?"
Chinese: "事故发生时你在干什么？"

English: "What were you doing last night?"
Chinese: "昨晚你在干什么？"